Date Calculation Assistant vs Just Roll
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Date Calculation Assistant
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Date Calculation Assistant helps you perform date calculations quickly and easily. Key Features: • Date Difference: Calculate the number of days between two dates. Select a date range and instantly see the result. • Date After: Calculate the date N days after a given date. Pick a base date, enter the number of days, and get the target date. • Date Before: Calculate the date N days before a given date. Pick a base date, enter the number of days, and get the target date. • Calculation History: All calculations are saved automatically. Browse, review, and reuse your past results in the History tab of each feature. Use Cases: - Plan project timelines and deadlines - Count days until or since important events - Calculate ages and durations - Plan travel or event dates - Track days between appointments or milestones Date Calculation Assistant features an intuitive interface with Calculator and History tabs for each tool, making date math simple and efficient. Terms of Use: https://date-calculator-2cf52.web.app/#/eula
Just Roll
This teleprompter app helps you read scripts naturally while maintaining eye contact with the camera. It offers flexible overlay and full-screen modes, customizable controls, and robust script management, all designed for a seamless recording experience.
- Floating script overlay
- Full-screen focus mode
- Magnetic snap zones
- Adaptive layouts for iPad
- Extensive control options
- Script management with templates
- Privacy-focused design
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Film yourself with the rear cameras of iPhone Duo, not the selfie camera, and read your script on the outer screen over a live, mirrored picture of the shot. On any iPhone, Just Roll floats your words over the camera preview, so you keep eye contact and finish the take without memorizing a line. Write it. Roll it. Post it. FILM WITH THE REAR CAMERAS ON IPHONE DUO Unfolded, Just Roll films with the rear cameras. Turn the phone around and the outer screen faces you while you're filmed: • A live, mirrored picture of the shot, with your script scrolling across the top, the self-timer's count and REC • Hold it upright or turn it sideways: the picture stays the right way up • Between takes, tap the outer screen to make it your recorder, just like the closed phone's; the big screen turns black until you tap it • Save or Go Again right on the outer screen, with playback • Close the phone to use the front camera MORE ON IPHONE DUO • Write on one page; read time at your speed, the Script Coach and your takes on the other • Pick a script on one page and its read time, preview and takes open on the other • Held upright, the script sits on top and your library below, with Start Recording under your thumbs • Stand it half-folded and the record button and controls sit below the hinge, off the fold • Fold or unfold it mid-read and the prompter keeps your place AI SCRIPT COACH (PRO) A writing coach that runs on your device: • Write It From My Notes: bullet points in, a full spoken draft out • Make It Spoken: rewrites essay-ish drafts to sound like you talking • Tighten to Time: fits your script to a 30-second to 3-minute read at your pace • Hook Ideas: three alternative openings to pick from Nothing replaces your script until you approve it, and nothing is uploaded. (Requires Apple Intelligence.) YOUR TAKES ARE SAVED • A phone call, a swipe to the Home Screen, even a full disk: your footage is finalized and saved • Takes are numbered by script and auto-save to your Takes library, Camera Roll or both • Bad take? Tap Go Again to scrap it unwatched and start back at your first line • Record up to 4K, front or back, with zoom, tap-to-focus, AF/AE lock and a ring-light mode that makes your screen a soft key light RUN IT FROM ACROSS THE ROOM Six kinds of remotes, every button remappable: Bluetooth keyboards, presentation clickers, foot pedals, Bluetooth game controllers, headphone and media remotes, and volume buttons. Map any of them to start/stop, speed, page jumps, font size or recording. A PROMPTER THAT MATCHES YOUR PACE • Set words per minute once; adjust live with a tap, swipe or remote • Hover Mode floats the prompter over your camera preview; Focus Mode goes full screen • Bionic reading highlights keep your eyes on the line • A 2-second lead-in before the scroll starts, and an optional 3- or 10-second self-timer before you record • Unlimited scripts and projects, templates, [PAUSE] and [CUE] tags, and read-time estimates at your pace • Start a take or a new script with Siri, Spotlight, the Shortcuts app or the Action button • Larger Text sizes across your scripts, the editor, Takes and Settings ON IPAD Two panes for Scripts, Takes, Home and the editor. With a keyboard, ⌘N starts a new script and ⌘R starts recording. FREE AND PRO Just Roll is free for 3 prompter sessions every month, with full recording features and no watermarks. Just Roll Pro adds: • AI Script Coach, on-device and private • Unlimited sessions Monthly $0.99 · Annual $9.99 (7 days free for new subscribers) · Lifetime $19.99, paid once Prices shown in USD; your App Store storefront sets the final price. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in Settings → [your name] → Subscriptions. Support: support@onworld.tech Terms of Use (EULA): https://onworld.tech/just-roll/terms Privacy Policy: https://onworld.tech/just-roll/privacy
Screenshots
Verdict
The clearest difference is iOS requirement: Date Calculation Assistant at 15.0 against Just Roll's 18.0. On price, update cadence, ads and in-app purchases 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
Both are free to download. Date Calculation Assistant sells 2 in-app purchases, starting at $0.99 per month and Just Roll sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Date Calculation Assistant ships an update every 5 days, Just Roll every 4 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | Date Calculation Assistant | Just Roll |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 days | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 35 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | 玉辉 黄 | On World Tech LLC |
In-app purchases
Date Calculation Assistant
- Monthly Subscription$0.991 Month
- Yearly Subscription$5.991 Year
Just Roll
- Just Roll Pro (Monthly)$0.991 Month
- Just Roll Pro (Annual)7 Days trial$9.991 Year
- Just Roll Pro (Lifetime)$19.99
Questions
Is Date Calculation Assistant free?
Is Just Roll free?
Do Date Calculation Assistant or Just Roll have ads?
Which is updated more often, Date Calculation Assistant or Just Roll?
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