Mangrove Tools

Marketing decision support

Make the next marketing decision with evidence.

Use the history you already have to compare channels, surface uncertainty, and choose a measured next step.

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Free, in-browser, no accounts. Inputs stay on your device.

Decision model / 04-week sample

A useful answer sets a limit.

Illustrative
Illustrative channel response comparison Paid search shows a stronger response than paid social in a four-week example. A marked decision zone limits a possible reallocation to ten percent. CURRENT SPEND ADDITIONAL SPEND → ≤10% TEST BOUND
01 Observation
Paid search converted more efficiently across the available four-week history.
02 Bounded move
Shift up to 10% of paid social allocation to paid search.
03 Recheck
Review after 30 days. Stop if acquisition cost rises or conversion quality falls.

Example only. The evidence determines whether a move is warranted.

From records to a measured move

Put a boundary around the next decision.

A short operating history can narrow the choice without pretending to remove uncertainty.

  1. 01 / Evidence

    Bring the evidence together.

    Start with comparable observations. This illustrative four-week snapshot is evidence to inspect, not proof of causation.

    Illustrative channel snapshot
    Channel Spend Conversions
    Paid search $12,400 372
    Paid social $9,800 196
    Referrals $4,600 138

  2. 02 / Checks

    Test what the history supports.

    Before moving budget, inspect the conditions behind the apparent difference.

    Coverage
    Enough comparable periods and complete channel records.
    Response shape
    Evidence of diminishing returns at the current spend.
    Timing
    Seasonality or campaign changes where they are relevant.
    Uncertainty
    A range that reflects how little history is available.

  3. 03 / Boundary

    Set the decision boundary.

    Turn the result into a small, reversible test rather than a permanent allocation.

    Reallocate up to 10% from paid social to paid search.

    Recheck window
    30 days
    Stop or revise
    If blended acquisition cost rises, conversion quality falls, or the difference disappears.

Analytics tools

Budget Advisor

Marginal ROI and optimized allocation.

Enter historical spend and conversions by channel. Get marginal CPA, recommended allocation, and expected conversions for your fixed budget.

Inputs
Spend + conversions per channel
Output
Recommended allocation, marginal CPA
Open Budget Advisor

Revenue Forecaster

Trend, seasonality, and scenarios.

Paste or enter historical revenue. Detect trend and seasonality, project forward with confidence bands, and test scenarios before committing to a plan.

Inputs
Historical revenue (CSV or manual)
Output
Monthly forecast, confidence bands
Open Revenue Forecaster

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Newsletter calculators

Supporting newsletter calculators

LetterROI Newsletter revenue calculator Monthly range from ads, sponsorships, and paid subscriptions. SponsorQuote Sponsorship rate calculator Flat fee, implied CPM, and a low/high band for your list. SubTarget Paid subscriber goal calculator Subscribers needed for a monthly revenue goal after fees. Media Kit Composer Newsletter media kit template One-pager from audience stats, rates, and placements. Inventory Planner Sponsorship inventory planner Slots, fill, and exclusivity → booked revenue and capacity.

Free marketing budget optimization, revenue forecasting, and newsletter revenue tools — with supporting sponsorship rate, subscriber goal, media kit, and inventory planning newsletter calculators. Client-side only. FAQ · Privacy

How the numbers work

About

Statistical, not made up

The analytics tools use real response-curve fitting and time-series decomposition — power-law curves and seasonal indices, not vibes. See the methodology on each tool page.

Your data stays put

Every calculation runs in your browser. Nothing you type is sent to a server. Privacy.

Free, with honest CTAs

No paywall on results. Optional affiliate links appear only after a tool has been useful.

FAQ

Full FAQ
What is Mangrove Tools?

A free in-browser marketing analytics suite for founders and small-business marketers, with supporting newsletter calculators for creators — based in Naples, Florida. About

Are the tools really free?

Yes. No accounts. No hard paywall on results. Optional affiliate links may appear after a tool has been useful.

Do the tools send my data anywhere?

No. Inputs stay in your browser. Privacy