Comparison

Theta vs Modem AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

About

Modem AI

Features
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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

Theta2 screens
Modem AI4 screens

Verdict

The call

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard1 real difference Ā· 5 level
Theta versus Modem AI: the parameters behind the verdict, then further details
ParameterThetaModem AI
PriceFreeFree
Update frequencyEvery 31 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Mac
Requires iOS14.0 — better15.0
Further details — not scored
Size8 MB42 MB
Age rating4+17+
DeveloperMikhail FedorovJoe Mayo

In-app purchases

None

Theta

No in-app purchases

None

Modem AI

No in-app purchases

Questions

Is Theta free?
Theta is free to download, with no in-app purchases.
Is Modem AI free?
Modem AI is free to download, with no in-app purchases.
Do Theta or Modem AI have ads?
Neither Theta nor Modem AI shows ads.
Which is updated more often, Theta or Modem AI?
Theta ships an update every 31 months, and Modem AI every 7 months. Most recently, Theta was updated on October 3, 2026 and Modem AI on October 7, 2026.

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