Astro Tools vs GrowCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Astro Tools
This comprehensive astronomy toolkit offers tools for planning celestial observations, finding and tracking targets, and capturing astrophotography. It includes AR sky planning, plate solving, and telescope control features for both observers and imagers.
- Augmented Reality Sky Planner
- Astro Camera with manual controls
- Plate Solver for astrophotos
- Telescope aiming and control
- Astronomy-focused weather forecasts
- Satellite tracking and visibility
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Every astronomy tool, in a single app. Astro Tools brings together the astronomy tools from Polar Scope Align Pro and Xasteria, while adding new tools including an Augmented Reality Sky Planner, Astro Camera, Plate Solver and a Digital Finderscope. It is a complete toolkit for amateur astronomers: plan the night, find targets, aim a telescope, check the weather, follow satellites, calculate an imaging setup and explore the sky - all from one app. PLAN THE NIGHT SKY Use any date, time and location to plan ahead. Browse Moon phases by month, with Moon and Sun rise, set and altitude graphs plus twilight times. Compare astronomy-focused forecasts for cloud layers, seeing, transparency, wind and precipitation, or use the Multi forecast to combine 7Timer’s astronomy data with MET Norway or Apple Weather forecasts. Check aurora forecasts, light pollution, animated satellite cloud maps, and the visibility of the ISS and other bright satellites. WIDGETS Keep essential observing information on your Home Screen. Widgets provide astronomy weather forecasts, aurora conditions and upcoming satellite passes. FIND AND OBSERVE Explore more than 22,000 deep-sky objects, stars and Solar System targets. Search, filter and create observing lists, then see object details and altitude charts. Turn a manual telescope into a Push-To system: attach your phone, select a target and follow live arrows. Sync on a known star or use star-hopping for improved accuracy. Digital Finderscope provides a live, zoomable sky map that follows your phone and guides you to a selected target. SEE THE SKY IN AUGMENTED REALITY AR Sky Planner overlays a star chart on your live camera view. Move through time to see where targets will be above the horizon or behind landmarks, whether you are planning an observing session or a nightscape photograph. CAPTURE, EDIT AND PLATE-SOLVE ASTROPHOTOS Astro Camera offers manual controls for photos and time-lapses, Star Trail mode with optional fading, and Deep Stack / Long Exposure mode to align and stack images taken with a tripod or tracker. Star Assist measures a selected star live to help you focus, while an optional sky overlay helps frame your shot. Photo Editor opens JPEG, TIFF, RAW and FITS images, or an Astro Camera stack. Develop RAW photos, adjust exposure, curves, colour and detail, crop and export. Plate Solver identifies stars in a photo to find its sky coordinates, field of view and orientation. Overlay constellation lines and object labels on the image. ALIGN, MEASURE AND CONTROL Polar-align a star tracker or equatorial mount without a polar scope, even in daylight. Start with the compass or calibrate using the camera on the Sun, Moon or stars. Use Laser / Hop Align when the pole star is obstructed, measure level and tilt, inspect GPS and sensor data, or control compatible WiFi mounts (iOptron, Pegasus Nyx and more). FOR OBSERVERS AND IMAGERS More than 30 calculators cover observing and astrophotography, with shared inputs and remembered values for quick comparisons. Find and simulate solar eclipses for your exact location, and use tools for field of view, magnification, exposure, focal length, image scale and more. Whether you observe with binoculars, a manual telescope, a GoTo mount or an imaging rig, Astro Tools keeps the information and practical tools you need close at hand. Many tools are completely free, for the rest there is a single Pro subscription with a free trial. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
GrowCalc
This app is a comprehensive lawn care toolkit that uses precision math and live climate data to help users grow healthier lawns. It offers tools for calculating fertilizer rates, logging applications, diagnosing issues with AI, and tracking weather patterns. Manage multiple lawn zones and access global pest pressure data.
- Precision NPK calculator
- Smart application logging
- AI photo diagnosis for weeds and diseases
- AI lawn assistant for expert advice
- Live weather and spray window forecasts
- Growing Degree Days (GDD) tracking
- Global pest and disease pressure monitoring
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GrowCalc — Precision Lawn Care in Your Pocket GrowCalc is the complete agronomic toolkit for lawn enthusiasts, homeowners, and turf professionals. Built on precision math and backed by live climate data, it removes the guesswork from every application so you can grow a healthier lawn with confidence — anywhere in the world. PRECISION NPK CALCULATOR: Calculate exact N-P-K rates per 1,000 sq ft (or 100 m²) for any product. Full support for granular, liquid, and ready-to-spray (RTS) formulations, with density, coverage, and dilution math handled automatically. Tank-mix multiple products in a single "cocktail" and see nutrient totals for the entire mix at a glance. SMART APPLICATION LOG: Log every fertilizer, herbicide, fungicide, insecticide, and plant growth regulator applied to your property. Track season totals per zone, monitor cumulative NPK, and export complete records for review or record-keeping. AI PHOTO DIAGNOSIS: Snap a photo of any weed, disease, insect damage, or nutrient deficiency and receive an instant identification with a step-by-step treatment plan — powered by advanced AI trained on turf science. AI LAWN ASSISTANT: Ask any lawn-care question and get expert-grade answers on demand. From product substitutions to timing questions, your personal agronomy advisor is always one tap away. LIVE WEATHER & SPRAY WINDOWS: Hyperlocal forecasts, hourly conditions, and soil data driven by your GPS location. Color-coded Spray Windows show whether the next seven days are Excellent, Good, Fair, or Poor for application — with clear "why" reasoning based on wind, rain, and temperature. GROWING DEGREE DAYS (GDD): Track live Growing Degree Days for your climate to time PGR reapplications, fungicide intervals, pre-emergent windows, and pest activity. Automatic reminders fire when it's time to reapply. BIO WATCH — GLOBAL PEST & DISEASE PRESSURE: Real-time pest, fungus, and disease pressure indicators for any location worldwide. Stay ahead of pressure spikes before they cost you a summer. SEASONAL AGRONOMIC CALENDARS: Month-by-month task schedules tuned to warm-season and cool-season grasses — covering fertilization, aeration, dethatching, pre-emergent timing, seeding, and more. PRODUCT LIBRARY & DASHBOARD: Save your go-to products with full labeled specs (NPK, active ingredients, coverage, application rates). Season-at-a-glance dashboard summarizes nutrients delivered, treatments logged, and upcoming reminders across every zone. WARRANTY & EQUIPMENT KEEPER: Store equipment receipts, maintenance history, and warranty expiration dates in one secure vault — with expiry countdowns so you never miss a claim window. MULTI-ZONE PROPERTY MANAGEMENT: Track front, back, side, and specialty areas independently. Perfect for enthusiasts, property owners, and pros managing multiple lawns. METRIC & IMPERIAL, WORLDWIDE: Every calculation, weather feed, and biological tracker works globally. Full dynamic unit conversion throughout the app — no matter where you live or what units you prefer. GO PRO Unlock GrowCalc Pro for full GDD projections, multi-zone tracking, season archives with CSV export, unlimited AI diagnoses, and priority feature access. Whether you're chasing that stripe-worthy backyard, managing a private estate, or maintaining multiple properties, GrowCalc puts professional-grade turf science in your pocket. Download GrowCalc and grow smarter today. Privacy Policy: https://growcalcs.com/privacy | Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Verdict
Astro Tools and GrowCalc are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. Astro Tools sells 3 in-app purchases, starting at $0.99 per month and GrowCalc sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for Astro Tools against 5.0 for GrowCalc. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
Astro Tools ships an update every 2 weeks, GrowCalc every 9 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Astro Tools | GrowCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 2 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 — better | 15.1 |
| Further details — not scored | ||
| Size | 35 MB | 53 MB |
| Age rating | 4+ | 12+ |
| Developer | Dimitrios Kechagias | REINALDO CAMACHO |
In-app purchases
Astro Tools
- Astro Tools Pro Monthly3 Days trial$0.991 Month
- Astro Tools Pro 6 Months3 Days trial$2.996 Months
- Astro Tools Pro Annual3 Days trial$4.991 Year
GrowCalc
- GrowCalc Pro7 Days trial$4.991 Month
- GrowCalc Pro7 Days trial$49.991 Year









