Interpolator vs Wader Pilot Logbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interpolator
Easily find values within tables using interpolation for two or three rows. This utility app simplifies calculations without needing a separate calculator, making it ideal for various table-based environments.
- Two-row interpolation
- Three-row interpolation
- Table value lookup
- No calculator needed
- Cargo surveyor tool
- General table use
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This is a small app which makes it very easy to look up values in tables (math etc) when you have to interpolate both in two and in three rows. No more need for a calculator to interpolate manually. This app was designed primarily for cargo surveyors working with tank calibration tables, but the app does have its application in any environment where tables are used. As of 13th January 2015, this app has become FREE until further notice.
Wader Pilot Logbook
This app simplifies flight logging for pilots by automatically filling in flight details from ADS-B data. It also provides pre-flight briefings, crew coordination features, and career overview statistics. Advanced features are available through an optional subscription.
- Automated flight logging from ADS-B data
- Pre-flight briefing with weather and NOTAMs
- Crew coordination and roster sharing
- Career overview with totals and maps
- Digital wallet for licenses and certificates
- Offline functionality and data syncing
- Exportable flight logs in various formats
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Your logbook, your next flight and your crew. In one app. 18,000 pilots have logged over 7.5 million flights with Wader. It fills in each sector from real ADS-B data, briefs you before you go and keeps you close to the pilots you fly with, on iPhone and iPad. ▶ A LOGBOOK THAT FILLS ITSELF IN • Real tail numbers and block times from ADS-B • Block and flight time worked out as you type • Crew, aircraft and airports suggested from your own history • Works offline at any airfield and syncs when you are back online • Find any flight in seconds: search by airport, tail, crew or flight number, then filter ▶ YOUR CAREER AT A GLANCE • Totals by function, aircraft and engine type, and every airport you have flown to on one map • Wallet: licences, medicals and certificates stacked like passes, the next to expire on top • Fleet: every type and tail you have flown, with your type ratings • Export a PDF in EASA, UK CAA, FAA, SACAA, GCAA or CASA layout, or a CSV, at any time ▶ BRIEFED BEFORE YOU GO • Your next flight on a map, on the ground and in the air, with your position • Alternates from the nearest airports, filtered by runway length • METAR and TAF decoded, with wind and gust warnings • NOTAMs in plain language, the original text always one tap away • A checklist for every flight, with reminders ▶ FLY WITH YOUR CREW • See where your friends are on a map, and the days you will be at the same airport • Compare rosters and chat • Log a flight once for the whole crew: it lands in every logbook and stays up to date • A feed for flights, alerts and aviation news ▶ BUILT FOR iPAD • A side bar and two panes: your logbook on the left, the open flight on the right • Briefing, Dashboard and chat with room to breathe ▶ GO FURTHER WITH WADER PRO • Live tracking of the aircraft you are about to fly: where it is, its inbound flight, delays and your gate • The TAF at your ETD and ETA, and live D-ATIS at US and Australian airports • Airport busy hours and briefs from real flight data • Unlimited ADS-B flights and every sector of your day in one tap • Imports from airline rosters, spreadsheets and other logbook apps • Recency: know when your take-offs and landings expire • Checklists synced across your devices, batch edit, a pilot CV, a stats report and priority support Wader PRO is an auto-renewing annual subscription. Payment is charged to your Apple Account when you confirm the purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in your Apple Account settings. Terms of use: waderaviation.com/terms-of-use Wader is a logbook and planning aid, not an official source. Weather, NOTAM, ATIS and tracking data come from third parties without any guarantee of accuracy: always check official sources before flight. Wader Aviation Corp is not liable for any damage resulting from the use of this app.
Screenshots
Verdict
The clearest difference is in-app purchases: Interpolator at none against Wader Pilot Logbook's 1. Interpolator also leads on rating (4.9 vs 4.6) and ratings volume (75 vs 22). Wader Pilot Logbook's advantage is review sentiment (98% vs 67%) and update cadence (every 2 weeks vs every 4 months). On price, 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
Both are free to download. Wader Pilot Logbook sells 1 in-app purchase, starting at $79.99 per year. Interpolator asks for nothing beyond the download.
Interpolator holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 75 and 22 respectively. Written reviews complicate that: 67% of Interpolator's written reviews are positive against 98% of Wader Pilot Logbook's, so the app with the better star average is not the one people write more warmly about.
Interpolator ships an update every 4 months, Wader Pilot Logbook every 2 weeks. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.
| Parameter | Interpolator | Wader Pilot Logbook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (75 ratings) — better | 4.6 (22 ratings) |
| Positive reviews | 66.7% of reviews | 98.1% of reviews — better |
| Number of ratings | 75 — better | 22 |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 18 MB | 141 MB |
| Age rating | +4 | 4+ |
| Developer | ron mooring | Wader Aviation Corp |
Customer experience
Interpolator
Wader Pilot Logbook
In-app purchases
Interpolator
No in-app purchases
Wader Pilot Logbook
- Wader Pro Annual$79.991 Year
Questions
Is Interpolator free?
Is Wader Pilot Logbook free?
Which has better reviews, Interpolator or Wader Pilot Logbook?
Do Interpolator or Wader Pilot Logbook have ads?
Which is updated more often, Interpolator or Wader Pilot Logbook?
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