This English text is a convenience translation. The legally binding version is the German original; German law applies and the German statutory references (§) are authoritative. In case of any discrepancy between the German and English versions, the German version prevails.
Imprint (Legal Notice)
Information pursuant to § 5 DDG (German Digital Services Act).
Service provider
Leo Martel
Ringstr. 8
15898 Neißemünde
Germany
Mutatool is a sole proprietorship of Leo Martel; MutaSprite is a product of this studio.
Contact
Phone: +49 156 78474139
Email: hello@mutatool.com
VAT identification number
VAT identification number pursuant to § 27a German VAT Act:
DE286397269
Responsible for content pursuant to § 18 (2) MStV (German Interstate Media Treaty)
Leo Martel
Address as above
Consumer dispute resolution
We are neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board.
Liability for content
As a service provider, we are responsible for our own content on these pages in accordance with general law pursuant to § 7 (1) DDG. According to §§ 8 to 10 DDG, however, we are not obliged to monitor transmitted or stored third-party information or to investigate circumstances that indicate unlawful activity. Obligations to remove or block the use of information under general law remain unaffected. As soon as we become aware of any such legal infringements, we will remove this content without delay.
Liability for links
Our website contains links to external third-party websites over whose content we have no influence. The respective provider or operator of the linked pages is always responsible for their content. As soon as we become aware of any legal infringements, we will remove such links without delay.
Copyright
The content and works created by us on these pages are subject to German copyright law. Reproduction, adaptation, distribution and any kind of exploitation beyond the limits of copyright law require the prior written consent of the respective author or creator.
Trademarks
"PICO-8" is a trademark of Lexaloffle Games LLP. "Game Boy" and "Super Nintendo Entertainment System" / "SNES" are trademarks of Nintendo. "Mega Drive" / "Genesis" is a trademark of Sega. These names are used solely to describe the corresponding colour palettes. MutaSprite is not affiliated with, endorsed by, or sponsored by these companies.
Credits
The "DawnBringer 16" (DB16) colour palette was created by DawnBringer.
Privacy Policy
As of 14 June 2026 · under the GDPR.
1. Controller
The controller within the meaning of the GDPR, the German Federal Data Protection Act (BDSG) and other data protection provisions is:
Leo Martel
Ringstr. 8
15898 Neißemünde
Germany
Email: hello@mutatool.com
2. General information on data processing
We process personal data only insofar as this is necessary to provide a functioning website or where a legal basis exists. This website is static, multilingual and works without login, profiling or tracking. The MutaSprite desktop application works locally — your sprite sheets are processed on your device and do not leave it (for the only exception, the update check, see section 7).
3. Hosting
This website is hosted by:
netcup GmbH
Daimlerstraße 25
76185 Karlsruhe
Germany
Legal basis: Art. 6 (1) (f) GDPR (legitimate interest in stable, secure operation). A data processing agreement pursuant to Art. 28 GDPR has been concluded with the provider.
4. Server log files
On every access, the web server automatically records data in server log files: IP address, date and time, name and URL of the file retrieved, amount of data transferred and HTTP status code, browser/version (user agent), operating system and, where applicable, referrer URL.
Legal basis: Art. 6 (1) (f) GDPR (functionality, attack detection, abuse prevention). The data is not merged with other sources. Access log files are deleted after 7 days at the latest; security-relevant logs may be kept for up to 30 days.
5. Cookies / local storage
The website sets exactly one strictly necessary cookie:
- Name:
lang · Content: your chosen display language as a language code (e.g. de, en — more languages to come) · Lifetime: 12 months · Purpose: to keep your language choice across visits.
The cookie is set only when you actively choose a language via the language switcher. Merely opening a page — even when the display language is detected from your browser setting (Accept-Language) — does not set a cookie.
The cookie is set without client-side script access (HttpOnly), with the Secure flag on encrypted connections, and is transmitted only to our own domain (SameSite=Lax). It contains no identifier by which you could be personally identified — only the language code. You can delete this cookie at any time via your browser settings; on your next visit your display language will then again be detected from your browser setting until you actively choose a language once more.
Legal basis: § 25 (2) no. 2 TDDDG — strictly necessary for the service you explicitly requested (your chosen language); no consent is required. We use no other cookies, no tracking, no analytics tools, no advertising networks.
6. External content
The website loads content exclusively from its own server. No external fonts (fonts are self-hosted), videos, maps, CDN or analytics services are embedded — no data is transferred to third parties when a page is loaded. Footer links (e.g. to GitHub) are only called when you actively click them; from that point the privacy terms of the respective third party apply.
7. Update check of the desktop application
The MutaSprite desktop application processes your image data exclusively on your device. The only exception is the update check: at your initiative (CLI command --check-update) or to notify you of new versions, the application retrieves a small version file from our own server (mutatool.com) and compares the version stated there with the one you have installed. In doing so — as is technically unavoidable for any retrieval of an internet address — your IP address and the installed version number are transmitted to our server and processed there as part of the general server log files (see section 4). No image data, no file contents and no other personal data are transmitted, no identifier is set and no usage profile is created. If the server is unreachable, the application silently reports "up to date"; no transmission takes place in that case.
Legal basis: Art. 6 (1) (f) GDPR (legitimate interest in informing you about updates and security updates and in maintaining functionality).
8. Purchase & licence
Checkout and payment processing do not take place on this website; the purchase buttons lead to an external seller (Merchant of Record). When you make a purchase, the following applies:
- Seller & payment: Depending on where you buy, the sale is handled by one of two Merchants of Record, each selling in its own name, processing payment and remitting (EU) VAT, and therefore an independent controller: Gumroad for purchases via Gumroad and itch.io (in its „Collected" mode) for purchases via itch.io. The respective provider's privacy terms apply; any processing in third countries (e.g. the USA) takes place within these providers' own responsibility on the basis of the safeguards they provide (EU Standard Contractual Clauses or the EU-US Data Privacy Framework).
- Licence key: To unlock, our self-operated licensing service (the „Keygen" software, hosted by us) generates a key; purchase/licence and activation data (e.g. device identifiers) are processed. Legal basis: Art. 6 (1) (b) GDPR (performance of a contract).
- Email delivery: The key is delivered via our own mail server. No separate external email service is used for this.
- Hosting & location: The licensing service and mail server run on our server rented from netcup GmbH (Karlsruhe, Germany); a data processing agreement with netcup is in place. On our side, these data are not transferred to any third country.
- Controlcenter: only looks up the key — no account, no session.
9. Contacting us
If you contact us by email, your details (email address, name where applicable, content) are stored to handle the enquiry. Legal basis: Art. 6 (1) (b) or (f) GDPR. The data is deleted once it is no longer required for the purpose.
10. Your rights
You have the right at any time to access (Art. 15), rectification (Art. 16), erasure (Art. 17), restriction of processing (Art. 18), data portability (Art. 20), objection (Art. 21) and withdrawal of consent (Art. 7 (3) GDPR). An informal message to hello@mutatool.com is sufficient. Insofar as we process data on the basis of legitimate interests (Art. 6 (1) (f) GDPR), you have the right to object at any time on grounds relating to your particular situation. No automated decision-making including profiling (Art. 22 GDPR) takes place.
11. Right to lodge a complaint with a supervisory authority
You have the right to lodge a complaint with a data protection supervisory authority. The authority responsible for us is the State Commissioner for Data Protection and the Right to Inspect Files of Brandenburg (Die Landesbeauftragte für den Datenschutz und für das Recht auf Akteneinsicht Brandenburg):
Stahnsdorfer Damm 77
14532 Kleinmachnow, Germany
www.lda.brandenburg.de
12. Data protection officer
We are not legally required to appoint a data protection officer and have not appointed one.
13. Changes to this privacy policy
We reserve the right to adapt this privacy policy where legal requirements or technical circumstances make it necessary. The current version is always available at mutatool.com/legal/datenschutz.
Note: the website will offer further display languages in future; the legal texts are available in German and English.
Right of Withdrawal
For consumers in contracts for digital content (distance selling).
Contracting party for purchases. Paid licences are sold through a Merchant of Record — Gumroad (for purchases via Gumroad) or itch.io in its „Collected" mode (for purchases via itch.io) — which sells the software in its own name, processes payment and remits VAT. For the purchase contract and the right of withdrawal, its terms and conditions and its withdrawal policy apply primarily and are shown to you during checkout. The withdrawal policy below applies only insofar as, exceptionally, a contract is concluded directly with Leo Martel.
Right of withdrawal
You have the right to withdraw from this contract within fourteen days without giving any reason. The withdrawal period is fourteen days from the day the contract is concluded.
To exercise your right of withdrawal, you must inform us (Leo Martel, Ringstr. 8, 15898 Neißemünde, Germany, phone: +49 156 78474139, email: hello@mutatool.com) of your decision to withdraw from this contract by a clear statement (e.g. a letter sent by post or an email). You may use the model withdrawal form below, although this is not mandatory. To meet the withdrawal deadline, it is sufficient that you send your notice exercising the right of withdrawal before the withdrawal period has expired.
Consequences of withdrawal
If you withdraw from this contract, the seller shall reimburse all payments received from you without undue delay and no later than fourteen days from the day on which notification of your withdrawal from this contract is received. The same means of payment that you used for the original transaction will be used for this reimbursement, unless expressly agreed otherwise; in no case will you be charged any fees for this reimbursement.
Early expiry of the right of withdrawal
In the case of a contract for the supply of digital content not on a tangible medium, the right of withdrawal expires pursuant to § 356 (5) BGB (German Civil Code) once the seller has begun performance of the contract after you have
(1) expressly consented to performance beginning before the end of the withdrawal period, and
(2) confirmed your awareness that, by giving consent, you lose your right of withdrawal upon the start of performance, and
(3) the seller has provided you with a confirmation of the contract pursuant to § 312f BGB (German Civil Code).
This express consent and the confirmation of awareness of the loss are obtained and documented during the seller's (Merchant of Record) checkout; once your licence key has been provided, performance is deemed to have begun. If they are not obtained, your right of withdrawal remains in place.
Model withdrawal form
(If you want to withdraw from the contract, please complete and return this form.)
To: Leo Martel, Ringstr. 8, 15898 Neißemünde, Germany, phone: +49 156 78474139, email: hello@mutatool.com
I/we (*) hereby withdraw from the contract concluded by me/us (*) for the purchase of the following digital content (*):
_____________________________________________
Ordered on (*) / received on (*): _______________
Name of consumer(s): _______________
Address of consumer(s): _______________
Date: _______________
Signature of consumer(s) (only for notification on paper): _______________
(*) Delete as appropriate.
Terms and Conditions
As of 14 June 2026.
1. Scope
These terms apply to the purchase and use of licences for the software "MutaSprite" and related modules from Leo Martel (Mutatool), Ringstr. 8, 15898 Neißemünde. A consumer is any natural person who concludes the transaction for purposes that are predominantly outside their trade or self-employed professional activity.
2. Subject matter & licence
With your purchase you receive a simple, non-exclusive, perpetual licence to use the purchased modules on up to three of your own devices. The free core (ChromaKey) remains free to use permanently; this commitment refers to the current scope of the free core, and future additional modules may be priced separately. You may not transfer, sublicense, rent out or publish the licence key to third parties.
3. Conclusion of contract, prices & payment
Contracting party for purchases. A purchase of a paid licence is not concluded with Leo Martel (Mutatool), but with the respective distribution partner (Merchant of Record) you buy through — Gumroad for purchases via Gumroad or itch.io (in its „Collected" mode) for purchases via itch.io. That partner sells the software in its own name, processes payment and remits VAT. For the purchase contract, payment and the right of withdrawal, its terms and conditions and its withdrawal policy apply and are shown to you during checkout. The relationship between you and Leo Martel regarding the use of the software is governed by the licence terms in these conditions (see § 2).
The presentation of the modules does not constitute a binding offer. The prices stated at the time of purchase apply as a one-time payment in euros, including any VAT. The mandatory information required immediately before the order pursuant to § 312j BGB (German Civil Code), and the legally prescribed button label ("order with obligation to pay" or similar), are provided during the seller's (Merchant of Record) checkout; the contract is concluded only with the order placed there that is expressly marked as subject to payment.
4. Provision & updates
After payment, the licence key is provided by email; activation takes place in the Controlcenter. Updates within the purchased modules are free. The Studio-Kit includes future modules. We provide the updates necessary to maintain conformity — including security updates — for the period you can expect given the nature and purpose of the digital product, in accordance with § 327f BGB (German Civil Code).
5. Liability for defects & liability
Liability for defects (statutory warranty rights): The statutory provisions on defects apply to the digital products purchased (§§ 327 et seq. BGB — German Civil Code — for consumer contracts). What counts as free from defects is determined both by the functional descriptions stated at the time of purchase (subjective requirements) and by the objective requirements under § 327e BGB — in particular fitness for the usual purpose and the quality customary in, and reasonably to be expected of, comparable digital products. We owe fitness for any purpose beyond that only where this has been expressly agreed. The limitation period for claims for defects in digital products is governed by the special periods of § 327j BGB.
Liability: We are liable without limitation for intent and gross negligence, for injury to life, body or health, under an assumed guarantee and under the German Product Liability Act. In the case of slight negligence, we are liable only for the breach of a material contractual obligation (an obligation whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely), and limited in amount to the foreseeable damage typical for the contract. Otherwise liability is excluded.
Data backup: The software works locally. You are responsible for an appropriate, regular backup of your input and output files; we are liable for data loss only as set out in the paragraph above.
6. Withdrawal
Consumers have a right of withdrawal in accordance with the withdrawal policy. For digital content, the right of withdrawal may expire early (§ 356 (5) BGB).
7. Final provisions
The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer with your habitual residence in another country, this choice of law applies only insofar as it does not deprive you of the protection afforded to you by the mandatory provisions of the law of your country of residence.
Should individual provisions of these terms be or become invalid or unenforceable, the validity of the remaining provisions is unaffected. The statutory provisions take the place of any invalid or unenforceable provisions.
