LeafSpy Pro vs HeadsUpDaddy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LeafSpy Pro
Monitor your Nissan Leaf's battery health, charging history, and vehicle diagnostics. Perform dealer-level functions like changing settings and reading trouble codes. Log data and sync to Dropbox for detailed analysis.
- Cell pair voltage monitoring
- Battery temperature readings
- Battery AHr rating and capacity
- Charging connection history
- Diagnostic Trouble Code (DTC) reading
- Tire pressure monitoring
- Trip and charge logging
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The Leaf Spy Pro allows anyone with a Nissan Leaf electric vehicle, an iOS 7.1+ device and a supported Bluetooth 4+ LE OBDII adapter (Vgate vLinker FD+ and MC+ OBDII adapters recommended) or a WiFi OBDII adapter, the ability to monitor their battery and other vehicle information normally visible only to the dealer. Support for English, Japanese, German, French, Chinese, Russian and Arabic languages. Note: The iPhone 4 and early iPads (2nd Gen) do NOT support Bluetooth 4+ LE. Currently supports 2011 to 2025 Leaf. (2026 Leaf not yet verified). Information displayed by Leaf Spy Pro: * Voltage of each of the 96 cell pairs (highlighted if shunt active) * Minimum, average, maximum cell pair voltages * Histogram of cell pair voltages * Battery Temperature readings (4 sensors for 2011/12 models, 3 for 2013 models) * Battery AHr rating (this will decease with age and is an indication of remaining capacity) * VIN * Odometer (miles or km) * Number of Quick Charge connections * Number of L1/L2 Charge connections * EVSE Max available amps * EVSE voltage * Battery energy level in GIDs & kWh * Resetable energy usage meter (Wh resolution) * Graphic display of SOC, GIDs and DTE (Distance to Empty) * Remaining distance meter (miles/km) to Event (Low Battery Warning, Very Low Battery Warning or Reserve) based on user selectable energy efficiency * Graphic display of battery temperature with min, avg, max temperatures * Tire Pressure of each of the four tires with low pressure warning and delta pressure warning alarm (not yet supported on 2018 Leaf) * Ambient Temperature * Displays climate control settings and power used. * Trip and Charge Log * Logging function that records most data and optionally GPS location to a csv file that can be easily imported into excel. * Dropbox support to sync Log files * Can run in background while connected to Leaf allowing you to use other apps. LeafSpy Pro also gives you the ability to perform functions normally requiring a visit to the dealer. * Change automatic door lock/unlock settings * Change VSP sound settings on 2013 to 2017 Leaf * Change Dash language on 2011 to 2017 Leaf * Read Diagnostic Trouble Codes (DTC) * Register Tire Positions (required after tire rotation or seasonal tire changes so your Leaf knows the correct location of each tire on the car) * Ability to reset DTCs from selected ECUs (including the DTC set when a different battery pack is installed.) * Special modes when only parts of a Leaf are used in a custom vehicle. Ability to create custom screens by creating a CSV file. See help file for definition format.
HeadsUpDaddy
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He doesn't know what week it is. Now he will. HeadsUpDaddy tracks the cycles of the women in your life — your partner, your daughter — and tells you, in plain language, what is actually going on and what is coming. A comedy product that happens to be accurate: the jokes are why you install it, the cycle maths is why you keep it. WHAT IT DOES • A DEFCON readout for the day: where she is, and how far out the hard stretch is • A daily briefing — the phase, the day inside it, the biology behind it, and what to actually do • Notifications before the difficult days, not after • Home Screen and Lock Screen widgets • Log a period from Siri, Shortcuts, or Control Centre THE RULE The joke is always aimed at you. Never at her. The mascot is a hapless dad who is not winning, and that is the entire point. Daughter profiles are locked to the plainest voice, with no jokes at all. SHOW HER There is a screen built to be handed over. It shows everything the app stores, everything it predicts, and a delete button that genuinely deletes. Consent is not an afterthought here — the app asks for it before it will start. PRIVATE BY CONSTRUCTION No account. No server. No analytics. No crash reporter. Her cycle data never leaves your phone. FREE AND FULL Free tracks one person in a plain, informational voice — complete and useful on its own. The full version is a single $2.99 payment, no subscription: track as many people as you need, and unlock both voiced tiers (Tactical, and the opt-in Unfiltered). NOT MEDICAL ADVICE HeadsUpDaddy is not a contraceptive, not a fertility treatment, and not medical advice. Predictions are estimates from logged dates.
Screenshots
Verdict
The clearest difference is price: HeadsUpDaddy at Free against LeafSpy Pro's $19.99. HeadsUpDaddy also leads on update cadence (every 4 days vs every 2 months). LeafSpy Pro's advantage is in-app purchases (none vs 1) and chart position (#9 vs unranked). On ads, device support and iOS requirement 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
HeadsUpDaddy is free to download; LeafSpy Pro costs $19.99 up front. HeadsUpDaddy sells 1 one-off in-app purchase. LeafSpy Pro asks for nothing beyond the download.
LeafSpy Pro ships an update every 2 months, HeadsUpDaddy every 4 days. The most recent releases landed on September 24, 2026 and September 23, 2026 respectively.
| Parameter | LeafSpy Pro | HeadsUpDaddy |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | 3.5 (114 ratings) — better | — |
| Positive reviews | 45.7% of reviews | — |
| Number of ratings | 114 — better | — |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Best chart rank | #9 — better | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 11 MB |
| Age rating | 4+ | 17+ |
| Developer | James Pollock | WakeSys sarl |
Bugs and requests
LeafSpy Pro
Reported bugs
5 issues- Doesn't connect via Bluetooth on iOS
- Crashes on startup after iOS updates
- Fails to load data despite being connected
- Doesn't work with Mini OBD2 scanners
- Can't change sounds on newer Leaf models
Requested features
5 requests- Add support for newer Leaf models
- Improve user interface and design
- Add Apple CarPlay integration
- Expand compatibility with more OBD2 dongles
- Improve documentation and in-app help
HeadsUpDaddy
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LeafSpy Pro
No in-app purchases
HeadsUpDaddy
- Full Version$2.99









