Comparison

Reformat vs Theo

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

Head to head
About

Reformat

This app converts images to various formats like JPG, PNG, and HEIC directly on your device, ensuring your data remains private and conversions work offline. It supports batch conversions and can retain original image metadata.

Highlights
  • On-device image conversion
  • Supports JPG, PNG, HEIC
  • Batch image selection
  • Action extension for sharing
  • Optional metadata preservation
  • Image quality selection
Features
Read full description

Reformat is a privacy-focused image converter which easily converts images on-device while keeping the original metadata. Your images do not leave the device during conversion, which means your data is safe at all times and the conversion even works offline. - Easily select multiple images from your photo library and convert them to any of the supported target formats (JPG, PNG, HEIC).* - Share images from any app to the Inbox via the action extension and convert images later once you are ready.* - Optionally keep the metadata of the original image so you never forget when or where you’ve shot the photo. - Choose an image quality for image formats supporting compression. *The free tier only allows for conversion of one image at a time. The Inbox is only available for Pro users.

About

Theo

This app helps you stop overthinking by guiding you through a structured analysis of your worries and decisions. It uses evidence-based reasoning to show you the actual probabilities of your concerns, replacing feelings with clarity.

Highlights
  • Structured journaling for worries
  • Evidence-based probability analysis
  • Interactive what-if sliders
  • Sensitivity analysis of evidence
  • Private thinking journal
  • Bayesian reasoning framework
Read full description

"76% chance they text you by 10 AM" - Theo "90% chance he is ghosting you" - Theo "82% chance your neighbor makes $100,000 to $115,000 per year" - Theo Stop spiraling. Start thinking clearly. Just write what's on your mind. Theo asks smart follow-up questions, gathers real evidence, and walks you through a structured analysis so you can see the actual probability of what you're worried about. Most people discover their worst-case scenario is far less likely than they feel. Think of Theo as a brilliant, patient thinking partner — available 24/7 in your pocket. HOW THEO WORKS 1. Journal your worry, decision, or question 2. Theo identifies what you're really asking 3. Answer a few clarifying questions so Theo better understands your situation 4. Theo gathers real-world evidence and weighs it for and against 5. See clear probabilities, not just feelings — then explore the reasoning behind every number WHY THEO WORKS • Evidence over emotion. Theo won't tell you to "think positive." It shows you data — real evidence for and against your worry — so clarity replaces anxiety. • Built on Bayesian reasoning. The same framework used by doctors, scientists, and intelligence analysts to make high-stakes decisions under uncertainty. Theo makes it effortless. • Explore your own thinking. Adjust the evidence yourself with interactive what-if sliders. See how your conclusions shift when your assumptions change. Build critical thinking skills over time. • Sensitivity analysis built in. Theo shows you which pieces of evidence actually matter most — so you know exactly where to focus your attention. • Your private thinking journal. Every session is saved. Revisit past analyses, track how your thinking evolves, and watch your relationship with uncertainty transform. WHO THEO IS FOR • Overthinkers who spiral on "what if" scenarios • Anyone facing a tough decision — career, relationships, health, money • Anybody with curious questions (e.g. "I wonder how much money my neighbor makes?") • People with anxiety who want a concrete, evidence-based alternative to rumination • Students and professionals who want to sharpen their critical thinking • Anyone who's ever lost sleep over something that turned out fine WHAT PEOPLE ARE SAYING "I wrote down something I'd been anxious about for weeks. Theo showed me the actual probability was 4%. I slept through the night for the first time in a month." "It's like having a therapist, a data scientist, and a best friend in one app." "I use Theo before every big decision now. It doesn't tell me what to do — it helps me see clearly so I can decide for myself." Theo Plus unlocks unlimited analyses, full reasoning breakdowns, and interactive what-if exploration so you can think clearly about everything that matters. Privacy Policy: https://thinktheo.app/privacy Terms of Service: https://thinktheo.app/terms

Screenshots

Reformat4 screens
Theo4 screens

Verdict

The call

The clearest difference is rating: Reformat at 5.0 against Theo's 4.2. Reformat also leads on ads (none vs shown) and update cadence (weekly vs every 2 weeks). Theo's advantage is ratings volume (16 vs 1). On price, in-app purchases, monetization model and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Reformat sells 1 one-off in-app purchase and Theo sells 9 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Reformat holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Theo has 16 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Reformat ships an update weekly, Theo every 2 weeks. The most recent releases landed on October 3, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
Reformat versus Theo: the parameters behind the verdict, then further details
ParameterReformatTheo
PriceFreeFree
Rating5.0 (1 ratings) — better4.2 (16 ratings)
Positive reviews—0.0% of reviews
Number of ratings116 — better
Update frequencyWeekly — betterEvery 2 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better16.6
Further details — not scored
Size8 MB42 MB
Age rating4+9+
DeveloperSascha GordnerKilby Labs Inc.

Customer experience

Reformat

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Theo

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Reformat

One-time1
  • Reformat Pro$3.99
9 purchases

Theo

Subscriptions9
  • Theo Plus - Weekly Subscription3 Days trial$4.997 Days
  • Theo Plus - Monthly Subscription$9.991 Month
  • Theo Plus - 3 Month Subscription$12.993 Months
Show 6 more
  • Theo Plus - Semiannual Subscription3 Days trial$39.996 Months
  • Theo Plus - Annual Subscription$39.991 Year
  • Theo Plus - Semiannual Subscription$39.996 Months
  • Theo Plus - Semiannual Subscription3 Days trial$59.996 Months
  • Theo Plus - Annual Subscription$69.991 Year
  • Theo Plus - Annual Subscription$99.991 Year

Questions

Is Reformat free?
Reformat is free to download, with in-app purchases available.
Is Theo free?
Theo is free to download, with in-app purchases available.
Which has better reviews, Reformat or Theo?
Reformat is rated higher. Reformat averages 5.0 out of 5 from 1 ratings, while Theo averages 4.2 from 16 ratings.
Do Reformat or Theo have ads?
Theo shows ads; Reformat does not.
Which is updated more often, Reformat or Theo?
Reformat ships an update weekly, and Theo every 2 weeks. Most recently, Reformat was updated on October 3, 2026 and Theo on October 20, 2026.

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