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Explore working instruments and practical field guides. Start with a question, try a demo, and see exactly what it returns.
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97 working demos
Token calculator
Estimate cost from token counts and your own rates.
Contrast checker
Measure the contrast between two solid sRGB colors.
URL inspector
Separate a URL into its host, path, query, and fragment.
Batch Caliper
Count words, characters, lines, and line lengths.
Remembrance Corpus
Find lines in supplied text containing every search term.
Classification Foundry
Apply your own keyword labels and inspect overlapping matches.
Text coverage trial
Compare two texts against the same required phrases.
Calculate SHA-256
Hash exact UTF-8 text. No trimming or normalization.
Verify a checksum
Compare exact UTF-8 text with an expected SHA-256 digest.
Inspect a URL
Parse HTTP(S) components and repeated query parameters without visiting the address.
Check color contrast
Calculate WCAG 2.x text contrast for two opaque sRGB colors.
Unit Forge
Do these quantities remain equivalent after a declared unit transformation?
Statistical Caliper
What is the center, spread, and observed range of this declared sample?
Sequence Spectrometer
Does this sequence expose a stable arithmetic or geometric rule?
Matrix Compass
Does this two-equation linear system have one stable solution?
Ohm Wheel
Can the remaining circuit quantities be solved from two declared values?
Divider Bridge
What voltage appears across the lower resistor in this unloaded divider?
Network Comb
What equivalent resistance does this declared series or parallel network present?
Filter Dial
What are the time constant and cutoff of this first-order RC network?
Resonance Fork
Where does this series RLC network resonate and how broad is it?
Beam Rule
What elastic deflection and maximum moment follow from this idealized beam case?
Stress Press
What stress, strain, elongation, and yield margin follow from this axial load?
Shaft Dynamo
What mechanical power follows from this shaft torque and speed?
Flow Regime Glass
Does this internal flow lie in the laminar, transitional, or turbulent range?
Pipe Loss Gauge
What Darcy-Weisbach pressure loss follows from this straight-pipe fixture?
Break-Even Compass
How many units cover the declared fixed cost at this contribution margin?
Batch Cost Lens
What does this declared batch cost under the supplied token rates and retry assumption?
Runway Reservoir
How long does declared cash remain above zero under this bounded monthly projection?
Cashflow Orrery
Where is the lowest cash point across these declared monthly inflows and outflows?
Scenario Prism
What low, base, and high terminal values follow from three declared compound-growth paths?
Discounting Chronometer
What present value follows from these declared future cash flows and discount rate?
Classification Foundry (legacy)
Apply a declared phrase taxonomy to supplied records with dissent and explicit HOLD decisions.
Index Loom
Search supplied structured records or preview/return a selected metadata revision entirely in memory.
Remembrance Corpus JSONL
Parse and search supplied JSONL records, reporting malformed lines and SHA-256 hashes without reading or writing memory.
Filing Projection
Rehearse six inspect/classify/route/mark/project/receipt stages on declared object metadata with zero file or provider effects.
Symbol Sequence Measurement
Measure Unicode code-point frequency entropy, longest repeated run and native top-five n-grams in supplied text.
Pipe Loss with Declared Friction Factor
Calculate Darcy-Weisbach major head and pressure loss from a user-supplied friction factor and pipe conditions.
1D Elastic Collision Solver
Solve a perfectly elastic one-dimensional two-body collision for supplied positive masses and signed velocities.
Circle Area and Perimeter
Calculate standard floating-point circular area and perimeter from a supplied nonnegative radius and explicit unit label.
Ideal Alloy Density Rule of Mixtures
Calculate ideal density from explicitly selected weight- or volume-fraction inputs.
Axial Stress and Strain
Calculate average axial stress, engineering strain, and linear-elastic elongation using consistent supplied units.
Asteroid H–Diameter Estimate
Estimate diameter in kilometres from supplied absolute magnitude H and geometric albedo p.
Unit Forge
Does this quantity remain the same physical quantity after a declared unit transformation?
Statistical Caliper
What are the declared center, spread, shape, and order statistics of this declared sample?
Distribution Lens
What does this explicitly selected distribution assign to this point, this probability, and these tails?
Interval Gauge
What interval does this declared method and this declared level produce for this declared data?
Hypothesis Balance
What statistic, tail probability, and effect size does this declared test produce for this declared data?
Regression Transit
What straight line or polynomial does least squares fit to these points, and how well conditioned is that fit?
Sequence Spectrometer
Does this sequence match one of the declared rule families, exactly and verifiably?
Matrix Compass
What does this declared linear-algebra operation produce, and how close is this matrix to singular?
Numerical Root Dial
Where does this declared function cross zero inside this declared bracket?
Integration Planimeter
What definite integral does this declared quadrature rule produce, and how fast is it converging?
Uncertainty Propagator
How does declared input uncertainty propagate through this declared model, by two different methods?
Time-Series Sieve
What do the declared moving statistics, autocorrelation, decomposition, and anomaly scores show in this series?
Ohm Wheel
Given exactly two of voltage, current, resistance and power, what are the other two for one linear passive element?
Network Comb
What single equivalent element does this declared series or parallel network of one element type present?
Divider Bridge
What output voltage does this two-resistor divider produce, unloaded or with one declared load resistance?
Filter Dial
What time constant, corner frequency and (optionally) response magnitude does this first-order RC or RL network have?
Resonance Fork
Where does this ideal series or parallel RLC network resonate, and how wide is its half-power band?
555 Timing Fixture
What ideal interval, period and duty ratio follow from these 555 timing components?
Conductor Drop Fixture
What direct-current resistance, voltage drop and resistive heating does this declared conductor run produce?
Three-Phase Power Fixture
What apparent, real and reactive power does this balanced three-phase load draw at a declared power factor?
Beam Rule
What elastic deflection and bending moment does this explicitly supported textbook beam case produce?
Section Caliper
What area, centroid, second moment of area and section modulus does this declared cross-section have?
Stress Press
What axial stress, strain and extension does this declared load produce inside the elastic range?
Shaft Dynamo
Given exactly two of torque, rotational speed and mechanical power, what is the third?
Bolt Torque Fixture
What tightening torque corresponds to a declared preload for a declared nut factor, or the reverse?
Thin-Wall Vessel Fixture
What membrane stresses does this internal pressure produce in a thin-walled cylinder or sphere?
Spring Coil Fixture
What rate, force and stored energy does this declared spring produce at a declared deflection?
Bearing Life Fixture
What basic rating life follows from a declared catalogue dynamic load rating and a declared equivalent load?
Flow Regime Glass
What Reynolds number and declared regime band does this internal pipe flow fall into?
Pipe Loss Gauge
What friction pressure loss does this straight circular pipe run produce at the declared flow?
Streamline Balance
Along one streamline with a declared head loss, what is the single unknown pressure, velocity or elevation at point 2?
Pump Power Fixture
What hydraulic and shaft power does this declared duty point require at a declared efficiency?
Ideal Gas State Fixture
Given three of pressure, volume, mass and absolute temperature plus a declared molar mass, what is the fourth?
Conduction Ladder
What steady heat rate passes through this declared layered plane wall or cylindrical shell?
Convection Plate
What convective heat rate follows from a caller-supplied heat transfer coefficient?
Sensible and Latent Fixture
What sensible and latent heat does this declared mass require for the declared temperature change and phase fraction?
Exchanger Effectiveness Fixture
What effectiveness, duty and outlet temperatures does this explicitly supported exchanger arrangement produce?
Expansion Rule
How much does this declared length change over a declared temperature interval?
Mass Property Fixture
What volume, mass and standard weight does this declared solid have at a declared density?
Factor of Safety Comparator
What is the ratio of a declared capacity to a declared demand, and how does it compare with a declared required ratio?
Tolerance Stack Bench
What worst-case and root-sum-square limits does this one-dimensional dimension chain produce?
Fatigue Curve Reader
What life or stress does the caller's own stress-life curve give at a query point strictly inside the supplied data?
Uncertainty Reporter
What combined and expanded uncertainty do these declared contributions produce, and how should the result be written?
Runway Reservoir
Track a declared cash balance period by period under declared revenue and expense paths, declared one-time events, and a declared minimum-cash threshold, and report where the balance crosses zero or the threshold inside the declared horizon.
Cashflow Orrery
Walk a declared series of inflows and outflows, either by period index or by ISO date, and report the running balance, the trough, the first recovery crossing after the trough, and a reconciliation of the whole series.
Scenario Prism
Run one registered Instrument three times over three complete, separately declared assumption arms and place the arms side by side with the declared comparison metric, without assigning any probability to any arm.
Discounting Chronometer
Discount a declared cash-flow series at a declared rate, expose the full period-by-period discount schedule, report payback on both an undiscounted and a discounted basis, and state explicitly whether a terminal value was included or omitted.
Margin Loom
Weave declared price, variable cost, fixed cost, and volume into a contribution-margin statement with break-even volume, target-profit volume, margin of safety, and a declared one-parameter sensitivity table.
Cohort Tide Table
Project declared cohorts forward across a bounded horizon using a declared retention curve and declared revenue per retained unit, and expose the whole cohort-by-period table rather than only a total.
Pricing Fulcrum
Compare a declared pricing baseline against declared price-change scenarios, moving volume only through a user-declared elasticity and functional form, and report contribution across a churn-adjusted horizon.
Capital Burn Furnace
Model declared compute and model spend period by period from declared unit volumes, declared unit costs, a bounded retry model, declared fixed infrastructure, and a declared usage ceiling.
Homepage Source Review Index
Build an exact-token, line-level index with duplicate/conflict candidates and a non-ingesting human review gate.
Homepage Transcript Candidate Recovery
Extract explicit Idea, Project, and Agent candidates with source spans from supplied transcript text for review.
Homepage Agent Proposal Package
Create an inspectable, disconnected agent proposal package using the homepage’s two catalog-backed proposed instruments.
Homepage Receipt Comparison
Compare two supplied receipt texts by SHA-256 and complete line membership without reading a receipt location.
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