HeatonCA vs Castmates
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HeatonCA
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Evolve colorful cellular automata rulesets and view existing ones. A gallery of known cellular automata is built into this application, additionally you can evolve your own new rules. This application implements the algorithm described in the paper: Evolving continuous cellular automata for aesthetic objectives in Genetic Programming Evolvable Machines, Heaton, J. March (2018). You can try out three different rulesets provided by this program. For more details of the algorithm refer to the cited paper.
Castmates
Engage in private, on-device AI chat stories with a diverse cast of characters. This app offers interactive narratives that remember past conversations and work offline, with options to create your own characters and scenarios.
- On-device AI for privacy
- Offline chat functionality
- 35 pre-made characters
- Custom character creation
- Interactive storytelling
- Session memory
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Castmates is a private, on-device AI app for interactive character stories, running entirely on your iPhone. Most AI apps send every word you type to the cloud and make you sign in. Castmates doesn't: the model lives on your device, so your conversations are never sent to a server, there's no account, and it even works offline. Meet a cast of 35 characters who actually stay in role. They don't reply like a chatbot: they narrate the scene, act, and remember what happened last time, so the story keeps building each time you come back. A CAST FOR EVERY MOOD Meet 35 hand-crafted characters across 8 genres: • Friends & Mentors: a loyal best friend, a warm life coach, a hype-man trainer • Romance: slow-burn crushes and devoted partners • Fantasy: elven rangers, dark knights, fae sorceresses, gentle orcs • Sci-Fi: sardonic ship AIs, starship captains, curious aliens • Anime: tsundere rivals, shy schoolmates, bubbly childhood friends • Historical: Regency nobles, samurai, Renaissance inventors, jazz-age icons • Mystery & Horror: noir detectives, vampire countesses, eerie keepers • Adventure: pirates, treasure hunters, wasteland survivors DROP INTO A SCENE Every character comes with ready-made scenarios, 127 in all, so you can jump straight into a story, or set your own opening scene and tone. BUILD YOUR OWN Create custom characters end to end: name, persona, greeting, appearance, tone, and a signature opening scene. Set their avatar from your photo library. They'll act exactly the way you wrote them. PRIVATE BY DESIGN: ON-DEVICE AI The whole AI runs locally on your iPhone. After a one-time model download: • Your conversations are generated and stored on-device: never sent to a server • No account, no sign-up, no profile • Nothing is logged on our servers or used to train models • It keeps working in airplane mode: on a flight, on the subway, off the grid THEY REMEMBER YOU Castmates summarizes past sessions, so characters recall who you are and pick up the thread days or weeks later. FREE TO START Start free with the full cast. Upgrade to Castmates Pro for unlimited messages and unlimited custom characters, and like everything else, they stay private on your device. Castmates Pro options: • Monthly subscription • Annual subscription (best value) • Lifetime purchase (one-time, not a subscription) Payment is charged to your Apple ID at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period; the Lifetime option is a one-time purchase that does not renew. Manage or cancel anytime in your App Store account settings. Privacy Policy: https://get-castmates.com/privacy Terms of Use (EULA): https://get-castmates.com/terms
Screenshots
Verdict
The clearest difference is in-app purchases: HeatonCA at none against Castmates's 3. HeatonCA also leads on device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Castmates sells 3 in-app purchases, starting at $6.99 per month. HeatonCA asks for nothing beyond the download.
| Parameter | HeatonCA | Castmates |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.2 (5 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 85 MB | 66 MB |
| Age rating | 4+ | 17+ |
| Developer | Jeffrey Heaton | JOSIP MARKOVIC |
In-app purchases
HeatonCA
No in-app purchases
Castmates
- Castmates Monthly$6.991 Month
- Castmates Annual$29.991 Year
- Castmates Lifetime$44.99









