RapidExposure vs I Ching AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RapidExposure
This app transforms your iPhone into a professional exposure meter. It continuously measures light and displays ISO, F-stop, and shutter speed values without needing to take a photo. You can adjust these settings and lock the exposure to save a reference image with the calculated values.
- Real-time exposure measurement
- Adjustable ISO, F-stop, and shutter speed
- Exposure lock and reference value saving
- History of saved exposure values
- Tap-to-adjust exposure on preview
- Detailed 1/3 step display mode
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This app will turn iPhone into exposure meter for cameras. It can continuously measure exposure value and indicate the information without releasing the shutter. It allows you to recalculate and indicate the shutter speed together with other ISO values and F values even during the measurement. The measurement is interrupted by the save button, and then write a row exposure value which iPhone automatically set into the image that iPhone had been taking, The image with the row exposure value is saved as a sample and displayed. It also displays the exposure value that the user has set. You can see the saved images on a list of images in the history window. You can adjust and rock the exposure on the tapped point of the preview screen. The exposure rock can be cancelled by the 'Auto' button. The shutter sound can be reduced by the volume button. However, it becomes the normal volume if it is set mute. At first the app puts high priority on ISO and F in exposure calculation. Under the exposure measurement, it indicates variable aperture stops (F-number) at a fixed shutter speed when you manually change the shutter speeds. Or, when you manually change the aperture stops (F-numbers), it indicates variable shutter speeds at a fixed aperture stop. If you change the ISO value, shutter speed or F-value changes depending on the mode at the time. The range of ISO vales, F values and shutter speeds are as follows. (In the new version, detail display mode is added in which F,ISO,SS values are changed by 1/3 step) ISO vales: "25","50","100","200","400","800","1600","3200","6400","12800","25600","51200" F values: "F0.7", "F1", "F1.4", "F2", "F2.8","F4", "F5.6", "F8", "F11", "F16","F22", "F32" shutter speeds: "60","30","15","8","4","2","1","1/2","1/4","1/8","1/15","1/30","1/60","1/125","1/250","1/500","1/1000","1/2000","1/4000","1/8000" ******** How to use: (1) Immediately after start-up, this application starts the exposure calculation automatically and it displays the values of ISO, F and SS in the wheel. (2) Exposure is recalculated in accordance with the subject that is reflected in the camera, the value of the SS will change accordingly. When you point the camera toward bright, the value of SS is reduced. Turning the camera to darker, the value of the SS will increase. (3) If you change the value of the ISO in the wheel, the value of the SS will change accordingly. Changing the value of F in the same manner, the value of the SS will change. Further, changing the value of the SS, the value of F will change. (4) If you tap the "Save" button, the exposure value displayed at that time is locked and a photo is taken. A reference exposure value that iPhone camera set to itself is written in the photo. (The reference value is different from that displayed in the wheel. It is not possible to set exposure value in the wheel to iPhone camera itself.) (5) If you tap the "measure" button, it restarts the exposure calculation and re-displays the values of ISO, F and SS. (6) If you tap the "History" button, the History window appears and the contents saved are listed. They are save date and time , photos and the exposure values you had set by the wheel when you save. (7) You can enlarge the photo by tapping it. (8) It changes to delete mode when you tap the "trash", delete mark appears in the photo that you tap. If you tap "Done", photos marked for deletion will be deleted. (9) **** This app uses OSS:AQGridView(Copyright(c) 2010-2011, Kobo Inc.) NOTE: However this app calculates ISO vale, F value and shutter speed based on the photos taken with the built-in camera, we are not able to guarantee the accuracy of these values.
I Ching AI
This app combines ancient I Ching wisdom with AI to offer personalized guidance on life's challenges. Get instant, private chat support for love, career, and relationships, with practical advice and actionable steps.
- Personalized AI readings
- Instant chat support
- Absolute privacy
- Authentic I Ching divination
- Practical guidance and advice
- AI-powered by ChatGPT-4o
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For 3,000 years, the I Ching has been consulted at moments of decision — by Confucius as the foundation of Chinese philosophy, by Leibniz when he formalized binary numbers, by Carl Jung as the structure behind synchronicity. 【 I Ching AI reads it with you.】 Bring any question — a career move, a difficult conversation, a relationship at a turning point — and the app casts the hexagram and walks you through what it points to. Not predictions. A structured way to look at your situation from outside yourself. 【You'll see:】 • The core tension in what you're facing • The choices in front of you, and what each direction implies • What to watch for, and what your next step might be • Follow-up questions you can keep asking until the picture clears Conversations stay private. Nothing is stored on our servers. — 【NEW TO THE I CHING】 The 64 hexagrams are explained in plain language. No background required. The AI moves between modern framings and classical commentary depending on what you ask. 【FOR LONG-TIME STUDENTS】 Changing lines and traditional readings are preserved. Reference the Wilhelm/Baynes translation or the original Confucian commentaries on request. 【USE IT FOR】 • Decisions you're stuck on • Difficult conversations you're drafting • Relationships you're trying to read • Career transitions • Reflection without an audience 【Pricing: 】 Free trial for first-time users! Monthly subscription with easy cancellation through the App Store. Download now and take the first step to transforming your future! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This app officially utilizes OpenAI's ChatGPT API under OpenAI's terms of service.
Screenshots
Verdict
The clearest difference is price: I Ching AI at Free against RapidExposure's $0.99. I Ching AI also leads on review sentiment (71% vs 38%) and update cadence (weekly vs every 2 months). RapidExposure's advantage is in-app purchases (none vs 5) and iOS requirement (12.0 vs 16.6). On ads 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
I Ching AI is free to download; RapidExposure costs $0.99 up front. I Ching AI sells 5 in-app purchases, starting at $4.99 per month. RapidExposure asks for nothing beyond the download.
RapidExposure ships an update every 2 months, I Ching AI weekly. Both last shipped on October 24, 2026.
| Parameter | RapidExposure | I Ching AI |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.0 (2 ratings) — better |
| Positive reviews | 37.5% of reviews | 71.4% of reviews — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 9 MB | 155 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | QOOQ inc. |
Customer experience
RapidExposure
I Ching AI
In-app purchases
RapidExposure
No in-app purchases
I Ching AI
- Monthly Subscription$4.991 Month
- Annual Plan$49.991 Year
- additional tokens$2.49
- additional tokens middle$4.59
- additional tokens large$8.99









