Neptune Odyssey vs Zero Chat
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Neptune Odyssey
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Odyssey helps you choose the right AI model for the jobβevery time. Your needs change throughout the day, and different models excel at different tasks. Odyssey makes it easy to compare leading models in one place so you can optimize for quality, speed, and cost. Whether youβre drafting content, troubleshooting code, or researching competitors, Odyssey helps you quickly match the best model to your workflowβso you can ship faster, improve output, and avoid overpaying. What you can do with Odyssey: Compare AI models side-by-side for the same prompt or task Match models to use-cases (writing, coding, research, etc.) Optimize for cost and performance with clearer tradeoffs Explore rankings/leaderboards to see how models stack up Odyssey brings the full Odysseytech.ai experience to your iPhone and iPadβnow in a fast, mobile-friendly app. Privacy policy: https://www.odysseytech.ai/privacy Terms of use: https://www.odysseytech.ai/terms
Zero Chat
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Zero Chat brings GPT, Claude, Gemini, and more AI models into one app. An active subscription is required. Choose the right model for the task. Browse models by provider, compare their strengths and token prices, or search for a favorite. Switch models in the same conversation when you want a different perspective. Plan a trip, draft a message, explore an idea, or work through a problem. Add photos from your camera or gallery, use web search, and set custom instructions. Your chats stay together across supported devices. A monthly auto-renewable subscription enables Zero Chat's AI features. Apple charges your Apple ID when you confirm the purchase. The subscription renews automatically unless you cancel at least 24 hours before the current period ends. Privacy Policy: https://zero-chat.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Zero Chat at every 4 days against Neptune Odyssey's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neptune Odyssey sells 6 in-app purchases, starting at $19.99 per month and Zero Chat sells 1 in-app purchase, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.
Neptune Odyssey ships an update every 2 months, Zero Chat every 4 days. The most recent releases landed on October 12, 2026 and October 19, 2026 respectively.
| Parameter | Neptune Odyssey | Zero Chat |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 4 days β better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 15.1 β better | 16.4 |
| Further details β not scored | ||
| Size | 49 MB | 72 MB |
| Age rating | 17+ | 4+ |
| Developer | Neptune AI LLC | Oleg Filimonov |
In-app purchases
Neptune Odyssey
- Monthly Pro access$19.991 Month
- Monthly Pro+ access$49.991 Month
- Monthly Pro max access$99.991 Month
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- Annual Pro access$191.991 Year
- Annual Pro+ access$479.991 Year
- Annual Pro max access$949.991 Year
Zero Chat
- Premium14 Days trial$8.991 Month








