15.ai: All about 15.ai and the best alternative

Everything you need to know about the AI voice platform 15.ai and the best 15.ai alternative for creating AI voice overs.

In 2020, 15.ai garnered recognition in the text to speech (TTS) space for its ability to bring characters to life through synthesized voices. Let’s explore everything you need to know about 15.ai, including why 15.ai shut down and the best alternative.

What is 15.ai?

15.ai was a freeware artificial intelligence AI voice platform circa 2020-2022 that generated high-fidelity text to speech voices. It gained popularity because it was the first AI voice platform that featured an assortment of fictional characters from a variety of media sources, including SpongeBob, My Little Pony, and more, so content creators for fandoms could use them in projects.

How 15.ai works

15.ai used advanced machine learning, speech synthesis, and deep learning algorithms, as well as voice cloning technology to generate high-quality and realistic AI voices. Users input text, choose their favorite character’s voice, and the platform converts it into speech in real-time, mimicking the chosen character's voice.

AI technology behind 15.ai

15.ai employs a multi-speaker model to train voices concurrently, which significantly reduces the time needed to clone voices with emotions. By leveraging data from various sources such as Oxford Dictionaries, Wiktionary, and the CMU Pronouncing Dictionary, as well as online platforms like 4chan, Reddit, and Twitter, they've built a diverse lexicon. Additionally, the automated deduction of pronunciations for unfamiliar words using English phonological rules and transcriptions learned by deep learning models demonstrates the sophistication of the technology.

15.ai history

15.ai launched in March 2020 after being developed by an MIT researcher only known by the pseudonym “15.” The platform was designed for the democratization of voice acting and dubbing using technology and allowed anyone to use it for free, with the only stipulation being that the project had to be for non-commercial use only, and the platform had to be properly credited when used. In fact, users didn’t even have to sign up for an account, so content creators, podcasters, and other users interested in incorporating AI voices into their projects could easily access it.

Does 15.ai still exist? What happened?

On September 8, 2022, 15.ai went offline for an update and never returned despite the Twitter account @fifteenai claiming as recently as February 2023 that the website would be updated, better than ever, and back online soon. As of February 2024, 15.ai is still offline and not operational as fans eagerly await its undetermined return.

15.ai features

Prior to going offline, 15.ai offered various high-quality voice generators. In fact, the platform has been credited as making AI voice cloning popular for content creation by being the first publicly open-source AI project to feature popular existing characters from fandoms such as My Little Pony: Friendship Is Magic, Team Fortress 2, and SpongeBob SquarePants. Some of 15.ai’s most popular meme-worthy voices include:

• Carl Brutananadilewski from Aqua Teen Hunger Force
• Dan from Dan Vs.
• Daria Morgendorffer and Jane Lane from Daria
• GLaDOS and Wheatley from Portal
• HAL 9000 from 2001: A Space Odyssey
• Sans from Undertale
• SpongeBob SquarePants
• Spy from Team Fortress 2
• Steven Universe from Steven Universe
• The Tenth Doctor from Doctor Who
• The Narrator from The Stanley Parable
• Twilight Sparkle from My Little Pony

Controversy surrounding 15.ai

Although 15.ai was only active for a short time, it was not without scandal. While the creator of 15.ai was dedicated to providing the service for free, they required users to credit the platform if they were to use the voices. However, this rule was ignored multiple times, with companies even claiming 15.ai’s voice cloning technology as their own.

15.ai vs. Voiceverse

In January 2022, users discovered Voiceverse NFT had generated Twilight Sparkle and Rainbow Dash from the show My Little Pony: Friendship Is Magic’s voices using 15.ai, pitched them to make them sound unrecognizable, and then used them as part of a marketing campaign without giving 15.ai credit. Voiceverse NFT, which had a partnership with anime dubbing voice actor Troy Baker at the time, also posted a now-deleted tweet allegedly inferring the voice had been created using their own platform. The creator of 15.ai claimed to have proved otherwise by finding plagiarized voice lines in the marketing video’s log files.

The creator of 15.ai speaks out on AI

The creator of 15.ai posted a series of tweets on X, formerly Twitter, regarding the misuse of 15.ai and its possible return, as well as addressed rumors. Here is a brief timeline the creator of 15.ai’s most important tweets:

• On January 15, 2022, @fifteenai posted about being depressed that their work was stolen and used for profit, claiming “the field of vocal synthesis” had become a “nightmare come true.”
• On May 5, 2022, @fifteenai posted that a “number of YouTubers and TikTokers” were voices generated from 15.ai “and failing to credit my work as stated in the terms (some going even as far as to deliberately misattribute the voices to different services in order to promote them).”
• On May 29, 2022, @fifteenai posted that they were still working on a 15.ai update, including an improved website design.
• On July 18, 2022, @fifteenai posted that the 15.ai was “almost done” and would come with “new character additions.”
• On July 18, 2022, @fifteenai posted, “I've been alerted that there appears to be a coordinated attack against my project by another service, with affiliated groups spreading rumors that I had abandoned 15.ai, or that I had placed it behind a paywall, or that I had killed myself, etc.” and “I assure you that I am still the same stubborn person I was three years ago when I first launched my project – please don't believe these malicious lies. I'm doing the best I can, and I'll always continue to do so.”
• On February 23, 2023, @fifteenai posted, “Quick update (and obligatory apologies for the delays). If all goes well, the next update should be the culmination of a year and a half of nonstop work put into a huge number of fixes and major improvements to the algorithm. Just give me a bit more time – it should be worth it.”

Speechify Studio - The #1 15.ai alternative 

Speechify Studio stands out as the premier alternative to 15.ai, offering a robust suite of features tailored to diverse audio and video needs. While it may not provide AI character voices like 15.ai, Speechify Studio boasts an impressive selection of over 200 lifelike AI voices spanning various languages and accents, virtually indistinguishable from human speech. Additionally, its advanced voice cloning capabilities empower users to create custom AI voice overs.

With its intuitive interface, users can seamlessly dub content into any language with just one click, expanding accessibility and audience reach. Speechify Studio also enhances videos with cutting-edge AI video effects.

Try Speechify Studio for free today and elevate any project, whether you wish to create social media content, video games, audiobooks, movies, or more.

FAQ

Is 15.ai still available?

No, 15.ai went offline on September 8, 2022, for an update and never returned.

What is the number 15.ai voice?

15.ai was an AI voice platform that went offline in 2022.

What is 15.ai's Twitter handle?

15.ai’s Twitter handle is @fifteenai.

What happened to the voices on uberduck.ai?

Uberduck removed user-posted voice models on July 21, 2023, after losing a lawsuit with Universal Music Group and facing backlash from the 2023 Writers Guild of America and SAG-AFTRA strike.

What is the best text to speech API?

Speechify offers the most realistic AI voices on the market at the most affordable pricing.

Can I use Speechify Studio on Apple?

Yes, Speechify Studio is a web-based platform, which means you can access it from any device, including Apple devices.