ONNOA vs Ephemis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ONNOA
This app acts as a remote control for a physical camera accessory, enabling advanced time-lapse photography. It offers features like linear time-lapsing, interval ramping, and long exposure control for professional results.
- Remote triggering
- Linear time-lapse
- Interval ramping
- Long exposure bulb mode
- Presets
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SmartTimer is a physical product from ONNOA. This app serves as a remote control for it. Stop making boring time lapses. The SmartTimer is a state-of-the-art remote shutter release and intervalometer. Connect it to your camera and create stunning images and timelapses without any limitations. With advanced features such as linear timelapsing, interval ramping, long exposures, presets and remote triggering, it is suitable for all photographers and astrophotographers who want to get the best out of their camera. Compact, easy to use and with a wide range of settings, our device is suitable for professional photographers and beginners alike. Take your photography to the next level with advanced interval control for professional results. Main features: - Linear time-lapse - Interval ramping - Long exposure bulb mode - Presets - Remote triggering
Ephemis
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Ephemis ranks the best deep-sky targets to photograph tonight — matched to your gear, your sky, and the Moon. It does the planning math so you can spend clear nights imaging instead of guessing. Point it at a date and location, tell it about your telescope and camera, and Ephemis scores thousands of galaxies, nebulae, and clusters by how well they fit your field of view and how long they stay high in a dark sky. WHAT IT DOES • Ranks 16,000+ deep-sky objects for any night, at any site • Scores each target on framing, altitude, available dark hours, Moon interference, and feasibility for your setup • Models real darkness — astronomical, nautical, or civil twilight — not just sunset to sunrise • Full Moon avoidance with broadband and narrowband profiles, plus per-night Moon tracks • Field-of-view fit for your exact optic and sensor, including multi-panel mosaics • Altitude charts with transit time, meridian flip, and your local horizon limits • Save targets to a project list, set hour goals, and log your imaging sessions • Best Nights view to find when a target peaks over the coming weeks BUILT FOR THE FIELD • Fully offline — every catalog is bundled, so it works with no signal under a dark sky • Messier, NGC/IC, Sharpless, Barnard, van den Bergh, LBN and LDN catalogs included • Native on iPhone, iPad, and Mac, with iCloud sync of your rigs, sites, and targets • Deep links to AstroBin references and Clear Outside forecasts Set up your rig and observing site once, and every night Ephemis tells you exactly where to point.
Screenshots
Verdict
The clearest difference is update cadence: Ephemis at every 3 days against ONNOA's every 4 weeks. ONNOA's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ONNOA ships an update every 4 weeks, Ephemis every 3 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.
| Parameter | ONNOA | Ephemis |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 4 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, Mac — better |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 52 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ONNOA GbR | David Roka |
In-app purchases
ONNOA
No in-app purchases
Ephemis
No in-app purchases









