DrainMaster Plus vs Flush
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DrainMaster Plus
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DrainMaster Plus shows you whether your plants get the right water and feed. Measure what goes into the pot and what drains out, and the app warns you early when salt builds up or the pH drifts. Every plant gets its own journal. Track electrical conductivity (EC), pH and temperature of your feed (nutrient solution) and of the water that drains out (runoff), in µS/cm, mS/cm or PPM (TDS). Calculators for humidity (VPD chart), light (DLI) and EC to PPM, a nutrient calculator for mixing and a grow journal (grow log, plant diary) with photos. For soil, coco coir, hydroponics, houseplants and indoor growing. Live readings over Bluetooth from compatible meters (pH meter, EC meter, pH pen). MEASURE • Guided measurement in a few steps or quick measurement • EC, pH and temperature for input and runoff • Bluetooth: live values directly from Apera meters (e.g. PC60-Z, PH60-Z, EC60-Z) • Display in µS/cm, mS/cm or PPM UNDERSTAND • Recommendations per plant to spot overfeeding, salt buildup and pH problems early • History and charts for every plant • Timeline with germination, stage changes, photos and notes • AI assistant: ask questions about your plant, the answers take its measurements into account (uses coins) TOOLS • VPD, DLI and EC/PPM calculators • Nutrient mixer COMMUNITY • Blog with posts and comments, translated automatically • Report content, block users, moderation with the option to appeal YOUR DATA • Works offline too, measurements and plants are stored on your device • Backup export and import • Optional DrainMaster Cloud: sync and automatic backup on up to 5 devices, 5 GB of storage for photos and 60 coins per month for AI features In 10 languages: German, English, French, Italian, Dutch, Polish, Russian, Spanish, Turkish and Arabic. Suitable for houseplants, hobby gardens, hydroponics and small professional setups. DRAINMASTER CLOUD (SUBSCRIPTION) DrainMaster Cloud is a monthly subscription that renews automatically. The price is shown in the app before purchase. Payment is charged to your Apple Account. The subscription renews unless it is cancelled in your account settings at least 24 hours before the end of the current period. Terms of Use: Apple's standard Terms of Use (EULA) apply: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://drain-master.de/datenschutz/
Flush
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Pay once for Pro. No subscription, no ads, no account. Works offline. Flush is the iOS calculator and grow tracker for gourmet and medicinal mushroom cultivation. Enter substrate weight, pick a species, and get hydration math, sterilization protocols, biological efficiency forecasts, and per-flush yield predictions. Named-source citations on every default — Stamets's Growing Gourmet & Medicinal Mushrooms, Cotter's Organic Mushroom Farming and Mycoremediation, Cornell Small Farms' Northeast Mushroom Project, Field & Forest plug-spawn standards, and peer-reviewed studies in Journal of Fungi and PLOS One. Hard scope: gourmet and medicinal edible species only. Oyster, lion's mane, shiitake, king oyster, reishi, maitake, pioppino, enoki, chestnut, turkey tail, and cordyceps militaris. Flush does not support, reference, or instruct on psilocybin or any controlled substance. Why named-source citations matter: practitioner trust depends on tracing every default — sterilization PSI/time, biological efficiency range, fruiting CO₂ ppm, spawn-to-bulk ratio — to a source you can verify yourself. Flush surfaces "Per Stamets:", "Per Cornell BMP:", "Per Field & Forest:" on every numeric default, with a Sources tab linking to the original references. Features • Hydration calculator: HWP, CVG, straw, Masters Mix, supp. sawdust, Wu '93 shiitake — exact water-to-add math, squeeze-test guidance • Grain spawn: rye, millet, wheat, sorghum, popcorn — per-grain hydration %, soak time, sterilization PSI / time, jar fill • Agar recipes: MEA, PDA, DFA (Cotter's Dog Food Agar shortcut) — scale to any volume • Liquid culture: 4% LME, honey, corn syrup — with downstream inoculation rates • Sterilization matrix: PSI / time / method per substrate • Biological efficiency forecast: per-species BE range × dry weight → lifetime yield with first-flush and per-flush decrement curves • Plug spawn for logs: Cornell BMP geometry + Field & Forest 50-plug standard + Hericium 80-plug exception • Eleven species library: oyster, lion's mane, shiitake, king oyster, reishi (kidney-cap vs antler CO₂ targets), maitake, pioppino, enoki, chestnut, turkey tail, cordyceps militaris — each with colonization and fruiting temp/RH/CO₂/BE/casing rules and citation lineage • Brand presets: Field & Forest, North Spore, Mushroom Mountain, Out-Grow • Multi-grow tracker: log substrate batches, readings (temp, RH, CO₂), events (inoculation, shake-break, fruiting init, FAE adjust, contamination), per-flush harvests with auto-computed BE • Sources tab: named-source attribution with direct links • Universal app for iPhone and iPad For home and small-farm growers using PF Tek, monotub, shotgun fruiting chamber, Martha tents, agar work, grain-to-grain transfers, liquid culture, and outdoor logs. Free download with the hydration calculator, BE formula, three species (oyster, lion's mane, shiitake), and one active grow. $6.99 one-time unlocks Flush Pro permanently: Masters Mix and supp. sawdust calculators, agar, liquid culture, grain spawn protocol, the expanded eight-species library, reishi's inverted CO₂ kidney-cap vs antler target, plug spawn for logs, multi-flush yield tracker, unlimited grows, and brand-aware preset detail. 48-hour trial starts when you first tap a Pro feature. Privacy: Flush collects nothing. No analytics, no accounts, no network requests. Your grows live on your device. Like calculators with citations? Look up Press (hard cider), Crust (pizza dough), Trace (cold-process soap), Splash (chlorine pools), and Hide (leatherworking) by the same developer.
Screenshots
Verdict
The clearest difference is update cadence: DrainMaster Plus at every 2 weeks against Flush's monthly. 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. DrainMaster Plus sells 5 in-app purchases, starting at $3.99 per month and Flush sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
DrainMaster Plus ships an update every 2 weeks, Flush monthly. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.
| Parameter | DrainMaster Plus | Flush |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 82 MB | 1 MB |
| Age rating | 12+ | 4+ |
| Developer | kobosil.me Development | Roman Kopaliani |
In-app purchases
DrainMaster Plus
- DrainMaster Cloud Monthly$3.991 Month
- 50 Credits$1.99
- 150 Coins$3.99
- 400 Coins$8.99
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- 1000 Coins$17.99
Flush
- Flush Pro (lifetime)$6.99
Questions
Is DrainMaster Plus free?
Is Flush free?
Do DrainMaster Plus or Flush have ads?
Which is updated more often, DrainMaster Plus or Flush?
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