Theta vs Modem AI
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Theta
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Theta-Meter standard e-meter app. Theta-Meter e-meter hardware can be connected to this app using Bluetooth LE 4.0 (or higher) or Wi-Fi connection. This app measures the electric resistance of the object, connected to Theta-Meter e-meter electrodes. This app is not intended to diagnose, treat, cure, or prevent any disease or medical or therapeutic use. Using a needle indicator, this app shows the dynamics of changes in the electrical resistance of an object connected to the Theta-Meter device.
Modem AI
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Modem AI is a private assistant for iPhone, iPad, and Mac. It runs a language model on your device, so your conversations stay there. There is no account, and your prompts stay on the device rather than going to a cloud chatbot. The first launch downloads Phi-3-mini, about 2.7 GB. After that, you can chat without a connection. Replies can take longer than a cloud service. That is the trade for keeping the conversation on the device. The model needs about 4 GB of available memory. What you can do ⢠Chat in natural language, including answers with lists and code ⢠Dictate a message with on-device speech recognition. Audio stays on the device ⢠Write a system message, and set temperature, top-p, and maximum response length ⢠Choose light, dark, or system appearance ⢠Copy a reply, start over, or clear history Privacy Your prompts and replies stay on the device. Modem AI does not read them. If you send feedback or report a reply, only what you choose to submit is shared. The app may send anonymous performance statistics, such as whether a feature succeeded. Those statistics do not include your conversations.
Screenshots
Verdict
The clearest difference is update cadence: Modem AI at every 7 months against Theta's every 31 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Theta ships an update every 31 months, Modem AI every 7 months. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.
| Parameter | Theta | Modem AI |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 31 months | Every 7 months ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Requires iOS | 14.0 ā better | 15.0 |
| Further details ā not scored | ||
| Size | 8 MB | 42 MB |
| Age rating | 4+ | 17+ |
| Developer | Mikhail Fedorov | Joe Mayo |
In-app purchases
Theta
No in-app purchases
Modem AI
No in-app purchases









